Microsoft Assessment and Planning (MAP) Toolkit for Windows 7 Enterprise

http://technet.microsoft.com/en-us/solutionaccelerators/dd627342.aspx

Windows 7 Upgrade Advisor

http://www.microsoft.com/downloads/details.aspx?FamilyID=1B544E90-7659-4BD9-9E51-2497C146AF15&displaylang=en

Windows 7 Application Compatibility List for IT Professionals

http://www.microsoft.com/downloads/details.aspx?FamilyID=890E522E-E39E-4278-AEBC-186F81E29173&displaylang=en

Microsoft Application Compatibility Toolkit

http://www.microsoft.com/downloads/details.aspx?FamilyId=24DA89E9-B581-47B0-B45E-492DD6DA2971&displaylang=en